Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cec7bec486e888…

MALICIOUS

PDF

74.3 KB Created: 2021-09-29 03:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc6a937c8afb02759e194a7705d23f3c SHA-1: a2fc68fdedf890d12ece00d0670ffd487caf470b SHA-256: 37cec7bec486e88899c66670d207cf29e577cf06074b267cb2b231492e291e9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure aiming to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://abwingsde.com/uploads/files/bekos.pdf In PDF document text
    • https://longhoang.vn/upload/files/60509755934.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/30993491012.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614334b689f8e---kijotusizugedelet.pdfIn PDF document text
    • http://guchen.ru/d/files/8304409808.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/8811893103.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/muwel.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/puguxonenujimujizafiga.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/memidew.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/geliwoguzajibew.pdfIn PDF document text
    • https://ikansambel.com/contents/files/voxunusati.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/99756802027.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/837870551220f93b4031d1b62392226d/xetojevadoko.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/jesijukidowa.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/gufukipotifozoke.pdfIn PDF document text
    • https://nistd.in/userfiles/file/27375776515.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/zuluvisuzimaxidonagexes.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/fujugumeb.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/56330049172.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16152d111dbee1---39003588277.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141699a12e92---kofumizenatimidokip.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/106adfae83e6b4ef74d9e450c6049111/lejemopelifasuvis.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/tawumepuruzuve.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210908_07FFB39110CD9FD3.pdfIn PDF document text
    • https://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/tibopoxuwawijavediw.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/lufeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sticker+maker+whatsapp+apkPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/59366441100.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8F 10620 bytes
SHA-256: 365df126e0f5c25a4333487782534ca191324d0e91f4f65d45f26c5c05dd040b
font_01_sfnt_off0000d3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 18372 bytes
SHA-256: 4a9efa06f7e44e5be27fd72c5a5377ecae8e1e504101793e46cebc56bf87a869

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